Developers: if you release any Haskell code, please document it for the

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The number of Haskell packages is growing rapidly. The section 'Haskell library collections' gives an ordering of all these packages by relative importance. In the section 'Haskell applications and libraries' an ordering by category is given. Finally some guidelines for developers of new packages are presented.

The most important Haskell library is called the [http://www.haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html Prelude]. It is implicitly imported by default, and includes the most commonly used functions. Make sure you know what they do and how to use them effectively.

* [http://hackage.haskell.org/packages/archive/pkg-list.html The Hackage database] - a collection of released Haskell packages

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See also [[Hackage]] and [[Cabal/How to install a Cabal package | how to install a Cabal package]].

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== Hackage ==

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=== The Haskell 2010 libraries ===

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The Haskell 2010 [[Language and library specification]] defines a set of [http://www.haskell.org/onlinereport/haskell2010/haskellpa2.html libraries] with basic functionality which all Haskell implementations should support, including the Prelude. Changes to these libraries are handled by the [http://hackage.haskell.org/trac/haskell-prime/ Haskell'] process.

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''Since 2006, new libraries are packaged and distributed from [http://hackage.haskell.org Hackage]''

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Haskell modules that almost everybody uses are in this group, for example:

and [http://www.haskell.org/onlinereport/haskell2010/haskellch41.html System.IO]. In GHC these are all grouped into the 'base' package.

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Start on Hackage if looking for a library not in the standard.

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=== The GHC standard libraries ===

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GHC comes with an expanded version of the Haskell 2010 libraries. Together these are called the [http://www.haskell.org/ghc/docs/latest/html/libraries/index.html GHC standard libraries]. Changes to these libraries are handled by the package maintainer if one exists, or the [[Library submissions]] process if not. [http://www.haskell.org/hoogle/ Hoogle] - the Haskell API Search Engine - indexes the [http://www.haskell.org/ghc/docs/latest/html/libraries/index.html GHC standard libraries].

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* Developers: you can [http://hackage.haskell.org/packages/upload.html upload your cabalised packages] to hackage (if you don't have a login, just ask).

On top of the GHC standard libraries, the [http://www.haskell.org/platform/ Haskell Platform] comes preinstalled with some additional packages that together form the [http://www.haskell.org/platform/contents.html#packages-and-documentation Haskell Platform libraries]. These libraries have been thoroughly tested before being included. The addition of these libraries with the [http://www.haskell.org/platform/ Haskell Platform] is what makes it 'batteries included'.

[http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] is the final layer of the Haskell library collections. [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] aims to provide a comprehensive collection of released Haskell packages, similar to Perl's CPAN or Python's PyPI.

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Start on [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] if you are looking for some functionality that did not come preinstalled with the [http://www.haskell.org/platform/ Haskell Platform].

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See also the [[Hackage|Hackage wiki page]] and [[Cabal/How to install a Cabal package | how to install a Cabal package]].

== Haskell applications and libraries ==

== Haskell applications and libraries ==

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Applications, libraries and tools for Haskell or written in Haskell:

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Applications, libraries and tools for Haskell or written in Haskell have been classified below, but you should check [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] for the latest list.

* The [http://www.haskell.org/mailman/listinfo/libraries mailing list] for discussion of issues related to libraries.

* The [http://www.haskell.org/mailman/listinfo/libraries mailing list] for discussion of issues related to libraries.

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* freshmeat.net has [http://freshmeat.net/browse/834/?topic_id=834 an alternative list of software written in Haskell]

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You can also [http://www.reddit.com/r/haskell_proposals/top/?t=month propose and vote on new libraries] that you'd like on [http://www.reddit.com/r/haskell reddit], and look at our past [http://hackage.haskell.org/trac/summer-of-code/ Summer of Code proposals].

== Guidelines for developers ==

== Guidelines for developers ==

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* [[How to write a Haskell program|How to write a new Haskell library]]

* [[How to write a Haskell program|How to write a new Haskell library]]

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* [http://pupeno.com/2006/12/12/the-lambda-revolution-v/ Creating a .deb from a Haskell Cabal package]

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* [[Library submissions|How to propose changes to the standard libraries]]

Revision as of 22:21, 3 October 2012

The number of Haskell packages is growing rapidly. The section 'Haskell library collections' gives an ordering of all these packages by relative importance. In the section 'Haskell applications and libraries' an ordering by category is given. Finally some guidelines for developers of new packages are presented.

1 Haskell library collections

1.1 Haskell Prelude

The most important Haskell library is called the Prelude. It is implicitly imported by default, and includes the most commonly used functions. Make sure you know what they do and how to use them effectively.

1.4 Haskell Platform libraries

On top of the GHC standard libraries, the Haskell Platform comes preinstalled with some additional packages that together form the Haskell Platform libraries. These libraries have been thoroughly tested before being included. The addition of these libraries with the Haskell Platform is what makes it 'batteries included'.